摘要
以广东佛山市西樵山(22°56'15"N,112°57'16"E)全新统厚153 cm的河湖相及红土为研究对象,在11个AMS-14C测年数据和沉积物主量元素分析的基础上探讨全新世以来该剖面的化学风化特征及古环境意义,对具有明确指示化学风化意义的脱硅富铝铁化指标Al2O3/SiO2和(Al2O3+TFeO)/SiO2进行分析,结合孢粉指示的古生态,确定了气候旋回与化学风化旋回之间的关系,为南亚热带地区全新世环境演变提供了地球化学证据。研究结果表明,西樵山全新统共记录了13次弱风化-冬季风事件,其中发生于2000 cal.a B.P.(xc1)、2900 cal.a B.P.(xc3)、4100 cal.a B.P.(xc4)、5300 cal.a B.P.(xc5)、7800 cal.a B.P.(xc10)、9300 cal.a B.P.(xc11)、9500 cal.a B.P.(xc12)和9700 cal.a B.P.(xc13)的事件可对应北大西洋深海沉积Bond事件1~8,前6次事件与南海陆坡北部的17940孔10 ka B.P.以来的6个弱季风事件相应,且这13个冷事件几乎都可与太阳黑子活动最小值阶段相对应。这意味着西樵山剖面全新世突变事件除受北半球高纬冰量变化的影响外,可能还在相当程度上受到太阳活动的强迫。
Located in the Xiqiaoshan of Guangdong Province in China, the Xiqiao section(22°56'15"N, 112°57'16"E) consists of fluvial-lacustrine facies and red soil with thickness of 153 cm. Based on AMS-14C age determination of 11 samples and elemental analyses for the section, through the analyses of Al2O3/SiO2 and (Al2O3+TFeO)/SiO2 values which indicate desiliconization and aluminization of chemical weathering strength, in combination with paleoecology indicated by sporopollen, the relationship between climate cycles and chemical weathering cycles is confirmed, which provides geochemical evidence for Holocene environment evolution in the south subtropical areas. The results show that the specific age of the Xiqiao section is from 620 cal.a B.P. to 11000 cal. a B. P.(see Table 2), and there are 13 winter monsoonal events characterized by weak weathering in the Xiqiao section during the Holocene, of which cold events occurring in 2000 a B. P.(xc1), 2900 a B. P.(xc3), 4100 a B. P.(xc4), 5300 a B. P.(xc5), 7800 a B. P.(xc10), 9300 a B. P.(xc11), 9500 a B. P.(xc12) and 9700 a B. P.(xc13) correspond to the Bond Event 1~8 from Marine sediments in the North Atlantic, especially, the former six events are consistent with six weak monsoonal events in Hole 17940 from the north of continental slope in South China Sea since 10 ka B. P., and 13 cold events almost correspond to the minimum radiation of sunspot activity. It is suggested that the abrupt climate variability in Xiqiaoshan during the Holocene is not only affected by the increase in ice volume at high latitudes in the Northern Hemisphere, but also by solar activity to a considerable extent.
作者
司月君
牛东风
李保生
王丰年
郭亿华
舒培仙
琚琛琪
Si Yuejun;Niu Dongfeng;Li Baosheng;Wang Fengnian;Guo Yihua;Shu Peixian;Ju Chenqi(Nanning Normal University, Nanning 530001, Guangxi;Lingnan Normal University, Zhanjiang 524048, Guangdong;South China Normal University, Guangzhou 510631, Guangdong;State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shaanxi;Huizhou University, Huizhou 516007, Guangdong;Guangzhou Institute of Geography, Guangzhou 510070, Guangdong)
出处
《第四纪研究》
CAS
CSCD
北大核心
2019年第3期629-641,共13页
Quaternary Sciences
基金
国家自然科学基金项目(批准号:41471159、41071136和41572345)
中国科学院地球环境研究所黄土与第四纪地质国家重点开放实验室基金项目(批准号:SKLLQG0809)
广东省自然科学基金项目(批准号:2015A030310183)共同资助.
关键词
广东西樵山
全新世
主量元素
气候突变
Xiqiaoshan of Guangdong Province
Holocene
major elements
climate change
